Mido Jumping Hours

The Mido Jumping Hours was also called Mido Evolution or Mido Direct Time. A patent for the case and the time display system was filed in 1931. However, the watch was officially released in 1933. The original feature of this piece was its display showcasing the hours, the minutes and the seconds in three separate windows. 

How did it work?

The disc for the units was in direct contact and triggered the disc for the tens, which made the hour disc jump when it reached 60. Note that the seconds are displayed on a continuous disc.